par(lwd = 2,
    cex.main = 2,
    font.lab = 2, 
    cex.lab = 2,
    font.lab = 2,
    cex.axis = 1,
    font.axis = 2,
    col.axis = "gray50",
    las = 1,
    mar = c(5.1, 5.1, 4.1, 0.5),
    bty = "n",
    pch = 19
    )
